The Sign of Four

How it reads

The Sign of Four is mystery (detective fiction, specifically), and its dominant mood is dark. It goes to difficult places and doesn't look away. The pace is moderate — neither a page-turner nor a slow burn — so it holds up whether you read it in long sittings or short ones.

It's set in a big city setting, in the historical past, told in the third person across several viewpoints. Its central concerns are justice and secrets. In weight it sits in the middle: substantial without being heavy going.

It's a later book in a series — you'll usually want to start earlier. The ending resolves happily. At 129 pages it's a single-sitting book. It's well known, the kind of book most keen readers have heard of.